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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91cb2c808d9f3af8314d5b3c259f23ba07269699adc3e80f2a7dff5472570dc3' 
  AND token = 'PeSbjwdkvS3Z5QbjlODd8cVbHR633824/4AY/y46/O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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