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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7be76ea174f8590ad1faf8c8e67dd1185d147ea526f22e81bf60ce159780dd4e' 
  AND token = 'g1/VNrN9YFui1JbQHG1L7feaWuTuC7obVr202V3jwWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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