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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '147b08fc51d3e22e1277eb3d1b5d8bd65b09e7bcfee28dabe44621cb2b3976e9' 
  AND token = 'y+OAQwrSr+Mlfb3Sv6QG7HBvG6a0jCczD0ZoWTABMwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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