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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58e8df6eeba6003bc548eb591f915ade7fe0e926ac40855c03d50f10bea3704f' 
  AND token = 'HvPuRKeFBCBi2UPkZRpwWohxKUokaiWGT5imcwC2/M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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