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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cca32f7ab9b39c38f8ca60a11caa35df23e41011cd87c21a07e0b4af8c1922f' 
  AND token = 'CdEn8P/heRLO37eSXpes17u247pBohEc87NTZwRZYH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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