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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3cd108ccaece5746465b941655b6a4b376718b65970524e66ef103b353934c3' 
  AND token = 'mzamVQ1zFPDE3hHea+lAnudRnVVU6iaPZDSZlC1y5C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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