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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd83aab728d1c152639f7f3a1f22fca1495a2c317d76aa93ab26e660e3a73f421' 
  AND token = 'rCQGzk91O1363FwT1OFr3FrssUjnf3hXfIeyWcVaC6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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