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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0823f1180844594f70ddf58fa6a3f055d956685648bdc01b86e5d6a6f27c2e2f' 
  AND token = '5nqOXLzT2ynTYORG8LYDRY/anuENLc9UG8Jrr2CmL2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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