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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c58729a7213b5033875b603b3e5f04210bf11f54b83c5cc6952a58ecebb7a5d8' 
  AND token = '4jIDo/yo02oH8DzMnoyHzM+oFe/4P+z4tEnd+6hPjaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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