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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b14594dd39c61cdab1c7c0762e2997db23bec4cb5f3100ef7d9264525259a83b' 
  AND token = 'pls8t3l97mx0tPFD1uz0YSSw88u3FmVYV+Ry5C9xCa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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