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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56422ef1780fdb0a658936a0f3766898be80f76fa0297ba01e88cd2c46a9264d' 
  AND token = 'R0VHNk/m8SW+633KUawK9owF4+N79Qu2+chIIqan4Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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