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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b19ca9a0aa287dfb2f44d432814551705f480158baea5d7830e00d938cd32e5' 
  AND token = 'Pp9QmxPzj1cLBMsPkQdEx1+3K9o7dS8ZLASEPp+72MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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