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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e51ce44a42ac95ea0c0573c27cf1e5ae99fab698c522efde14e142d03c7b2c3e' 
  AND token = 'vKLBal12X0VZpMm71yV5B+s4BTcipmUDKpQMJpa/6MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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