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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20783c8e432f50d655707e7abac3fe56ac6c91f608b90ac53a49ba0700d1ea2e' 
  AND token = 'pzSfkxMFgP+Qa4NTSh4TPX0HvaSLrvvVcLw7ffmBukw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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