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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2be80083b28fa2273e6fb7f649e323591a96060340773690027f83929eca9ab' 
  AND token = 'cNZvs33zfi48rSL9Yj8Hzk/FCI0FV4olWXRXBa2D/Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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