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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de72fa15a48a3b4ee3b3c96b3df38ae88da5aa31f26e2747f3565f7eafa9b40a' 
  AND token = '2Brkl5FfRWmfNwxTdwSjYY+Q1e73BZto0+HJ1dvtOc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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