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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1241b7615bee0ba946f0394a443bf25e8d63114ee845fa6f3b05f0abead5dd8e' 
  AND token = 'kIAUqXY1Biu3bAOPU9Il1XT1PSAXb+r6olsOGJ5BJcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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