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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15c85335fbfa8e014dfc993ed67b5b04d0fbc52fc25d217335828091610a2707' 
  AND token = 'sAIHWLUI122/P9F7O/FFfQ8v0S+Vf88OG60noG1Fnpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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