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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2ee426b97f1981c811fdfc0a57ecb0a09c1b2e9cfa3ea90da15aaad37c263ba' 
  AND token = 'sLNx3mVNJWGxKnSMEzbIp7i3wyj9mVDJ5E5V3SwTAis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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