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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae9305a67d0172de4fe9a8b73e3fd345c31183c69e45141f356a574cc9b0faa2' 
  AND token = '9AxPsx2n0D8NBqE2FCJPLI2A9wX1AjCoMxXharCdBIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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