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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc8659bce6d4f45c934119124ae5c77df30bb9c84b5379e48ec2e3d657d5cb2a' 
  AND token = 'zfjEQc3jR/iR17ONf8uNiI7UlHheB2boiZHpC1/FeOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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