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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d9b20360ac40302393fc0531fa8e9cc3f6117a310b3387e88151a5c7b2e7675' 
  AND token = 'LUl5/kHfBc2BzNZ7pOnuoopIeP50miEntny2TI+mFOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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