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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26dd68ed699188dcfbb2e62b56ebc56ac57c95ebf66a6662e5a2ea213285666e' 
  AND token = 'DUq/Tv8SN1j82+r30jP2vXj3lMkICahdhA7uw+lVzsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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