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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1d3a38c44478dd897219b611dd3e3f4674012d8b0ef11229debfc8251ea96d7' 
  AND token = 'g+LEQYerlHKyo/3/+iu17XQUuye+WIjrkyTjQ8mEA6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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