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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbcabcfbf20fe4edbe3c8f135e425d382d612af60c2ecbd7fc6ce3e1bd27108a' 
  AND token = 'TpQGlfV8B1zyDC7synA4yzvg6a6nrqn6K5G+RjQUT9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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