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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c82fc2ceb4c6a3452f8148b040b9e9d9b61a2498e11c58a4ee23993a6a050d18' 
  AND token = 'uMHN5HEJoj2v30bxOMrcg7n6DKZqUeOj8HORbQ14ky4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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