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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b379c286830599d51f2b30da7c2d1f126a12a1f2fc62cdbef594ac454e10e622' 
  AND token = 't+dr0T7PD9Uq2GOwnKV3dMDO/kI0kx6yzlCvub7r/io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}