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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '746a24aa14c70ffb73a15713c3a6a1aa450cdf05bda3141343738102e4575e0c' 
  AND token = 'lFFIQOf0TWDkLTGa+uH7mI0eh40vnjeORjZ6B9qwoE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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