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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fd66142d22db341250fe38cb219beabc1fff8663ff6350748bb2644cbf49ea1' 
  AND token = 'lugFBBySyNJB5sA5Ihei9iXHhz+ae5GRsTWN5nRyjOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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