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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9bdfb33e59f2756cf160c984224e54ba0eb319cd00587319bb8d0dbc64f59ac' 
  AND token = 'brp7oiyEy05v+8ebhUmktJsx5h6EUN1DatOkSyXA+x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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