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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1e76eb4cef7358c3c7503c93503775eb4751ed61f1751aae335d1953dc394c4' 
  AND token = 'cBolVw+/Uh5HEUtsYzvWr4ZQdnywQiTjNd48XRRM4EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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