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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7aa9b59b6c5b527255601ea21c85cecb3e23b8017cbe27edb75538c6c251bb82' 
  AND token = 'yxt5bWK+n+H6j+tVhrfl2U2KI46JeuD9blU3ovUPhRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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