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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20cb6db5c98de9c5a01cef26dcf4e44982aad9c8b7c73287237ae0ff4905c0b7' 
  AND token = '6bKniEFR5cgKD2S0hI7wnM9dHyPUaFZbgh33oIjGU3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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