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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '883a270bd96e3f8170677d9a144ba3df7cf202ce65fe610d91f0b69938708111' 
  AND token = 'NLaVQCAspD1pV2EhTC1DgS5zTCMs3OSRNgtLt6RWv/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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