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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35ecf54e6c80c66cfb05fb3cd2b1a301535cc068ed8a7f9b815b721017f23295' 
  AND token = '/ieI9y9mj4KgZE6unzeCgMcgx3WJXHLeSJjmQXrc9Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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