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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62174834e13d4c67d7a8a2a8367e47f612f1ef5c76014df6dc177f5bfe95b81b' 
  AND token = 'toBo49l+ji4CTzYKbYkkt7dxxR8XxGrdcPC2h0G3GqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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