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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e2bbdf64be5aaa7ed73878c19c6d58ab841c54be800354f954ab7ee014c2f3b' 
  AND token = 'CCX7UO39+O7zNGJ0dHRgZdGtOfkwO8F2nERnS3fUA3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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