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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98bbd9ec1c07690773e3d9176c39c4dcc70c12f07f2bb9074e3e70eed9f35999' 
  AND token = 'A38NvTzop1SHy+mP4SvTLySXQ2PjB1wpx2A7UyIAuNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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