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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b61b8014ffea7e9323642cdbdd1838c57eba54c7c1f3d6204e4ea29cc8e82be0' 
  AND token = '6X7bRdpnfshKojLAsudHkyWwB9aT/D6wY4JnSfBelBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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