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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42733d13df026a3c61a9fa3efc3094bc590536e55e26020734303bef9b683120' 
  AND token = 'LmgkQN1C3WFPOTzBBGdtw7G4Gz06xjohcfN2aK5Ge2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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