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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '311a604721d0c40eb26af51c12edaf124cc1029995ee1ed03a943ac18a4710d9' 
  AND token = 't/KHx+S8oeKBQkIhwOl0NPfUXo+HVBRRcpuLIyjHxoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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