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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd00a29fa55aa2cd7b4e83e3f97cde703c209cfc3df0800f351eebb9b2cf528d' 
  AND token = '7JTGN1D5aLKaVPaxneCSROHGi6fZM8ETSvoOqQ8mO8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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