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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6be9680b15c790ba757f753bd296013e9348770ce9ba7ef02ec7c4e6224f0903' 
  AND token = 'hfUlwlMrcaT2Pfiw0S1Z3WcifvgC/btEfAxFkhWe/R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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