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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28e2a55b07586ccaf489fcfded57a794ce64944e104fee20f40996e4735faf5d' 
  AND token = 'xx8fKwC6kz2h0DsclkkSp+1frfDQyCp8ezjxstLb91A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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