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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fa38083605a256ada5c7933f59051745a80f1264786dde030e4f6281d559128' 
  AND token = '8+vCvpicXW/lGmdKn1dnlxF27LYpztniunCGKMeoS9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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