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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f374ae45528aec9d675a956f708dd0f8ec0038ad39b40485153e96f8c068165a' 
  AND token = 'yucOcdFyJ367pVz4at4QbPKHaV44wZ9k8JXOeVJcrhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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