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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a917305d4932651f9af2611f16363c359eb979fc4fe74cb59a674ef97c1bc5bc' 
  AND token = 'EXXd9T5XdxVsxlMcWztxB9AMrbxX++wPI9ZCqzLqJzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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