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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da8e8f29b1f2de8b3ac76ecf5f12c90917a22ee3d80c5e4580e25604910e9b46' 
  AND token = 'HlQWuukgwUPI7utjTFhAH513muBeQTA/4Tt1SqFUt7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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