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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bab7dc3777e930311dc804ae78d6d1124955ba68a6a327c9ff5f6ab87b7202a7' 
  AND token = 'q2vtHGZxSsoLitoI3dB5Qb+DGskF4JGH/yQ9qdtIoUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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